Graduated cock for pneumatic tools



(No Mael.) 2 sheets-sheet 1.

' D. DRAWBAUGH.

GRADUATBD 000K POB, PNBUMATIG TOOLS.

No. 479,061. Patented July 19, 1892.

M mill (No Model.) 2 Sheets-Sheet 2.

D. DRAWBAUGH.

GRADUATBD 000K POR PNEUMATIG TooLs.

No. 479,061. Patented July 19, 1892.

' 35 ful and proper handling of the tool.

UNrrn rares ArnN'r einen.

DANIEL DRAWBAUGH, OF EBERLYS MILL, PENNSYLVANIA, ASSIGNOR TO THE PNEUMATIC AND ELECTRIC TOOL COMPANY, OF NEW YORK, Y.

GRADUATED COCK FOR PNEUIVIATIC TOOLS.

SPECIFICATION forming part of Letters Patent No. 479,061, dated. July 19, 1892.

Application filed April 13, 1892.

To all whom, it may concern: Y

Be it known that I, DANIEL DRAWBAUGH, of Eberlys Mill, in the county of Cumberland and State of Pennsylvania, have invented certain new and useful Improvements in Graduated Cocks for Pneumatic Tools; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying Ic drawings, forming a part of this specification, and to the letters of reference marked thereon. This invention has for its object to provide a cock adapted for controlling the supply of air to pneumatic tools, either to regulate the I 5 stroke of the same or to stop the su pply thereto entirely. Tools of the kind mentioned, as shown, for instance, in my patent, No. 472,495, dated April 5, 1892, as is Well known, are usually adapted to be held in the workmans 2o hand when in use, the Workman frequently iinding it necessary to use both hands to properly guide and handle the device, particularly in doing heavy, intricate, and nice work, and it has been customary to provide some means for regulating the strength or rapidity of the stroke, such as cut-off or throttling devices; but in practically all of such devices, While it was possible to set the same to cause the tool to run at a predeter- 3o mined speed or with a predetermined power, difficulty has been experienced in changing the speed or power of the tool without removing the tool from the Work or at least releasing the firm grip so essential to the success- This has led the Workmen in handling these tools to dispense with the use of mechanical devices and to control the tool by placing a nger or thumb over the exhaust -opening, thereby v4o throttling the exhaust, and by varying the size of the opening by simply moving the one iinger or thumb, as the case may be, control the tool effectually without removing it from the Work or releasing his grip ou thetool. This method of controlling the tool is manifestly imperfect and objectionable for many reasons, the inconvenience to the workman for one, and the danger of stopping up the exhaust-opening for another, to say nothing 5o of the almost impossibility of making the tool Serial No. 429,026. (No model.)

Y work exactly the same at different times,and

I design to overcome these objections and to provide a mechanical device which shall accomplish the desired ends perfectly.

In the accompanying drawings, Figure l is a perspective View showing the manner of using the graduated cock. Fig. 2 is a longitudinal section through the cock. Fig. 3 is a top plan View. Fig. et is a similar View with the handle attached. Fig. 5 is a detail top 6o plan and side elevation of the finger-piece and retaining-ring, respectively. Fig. 6 is a longitudinal section showing a slightly-different finger-piece. Fig. 7 is a top plan of the same. Figs. 8, 9, and l0 are details of con- 65 struction.

Like letters of reference in the several figures indicate the same parts.

The fixture or body A of the cock is formed with a passage extending through it, and at 7o one end is provided with a screw-thread o. or other means for attachment to the tool B, Fig. l, while at the opposite end it is adapted for connection with the supply-pipe, as the rubber tubing C, leading from an air-compressor or other suitable pressure-supply. At the center the body A has a transverse conical opening formed therein for the reception of the similarly-formed key or turning plug D, havingapassage or opening CZ therethrough 8o in line with the longitudinal opening in the body A. The lower portion of the conical opening in the bodyA is recessed or cored out for the reception of a spring E, which, bearing against the bottom of the recess and the washer e on the end of the key, serves to hold the key firmly to its seat under all conditions. The washer e and screw c', it will be understood, are of ordinary construction and are applied in the ordinary manner. At the up- 9o per end the key is provided with a fingerpiece Gr, preferably of a form particularly adapted t0 be operated upon by the workmans thumb, as shown in Fig. l. Figs. 1 to 5 show this finger-piece in the form of a disk 95 or wheel having a roughened or luted edge g and pivotally connected to the angular upwardly-proj ecting end D2 of the key, so as to permit of a slight oscillatory movement. At

one side the finger-piece is provided with a roo projection II, adapted to co-operate with a retaining-ring on the body of the cock to retain the key in adjusted position. To secure this result more eitectually by holding the parts in operative engagement, the upwardly-extending portion of the key is cut ott or chambered for the reception of a spring I, which presses against the under side of the finger piece on the side of its pivot t' opposite the projection H and elevates the rear side of the finger-piece, throwing the projection and retaining-ring into engagementwith a yielding pressure.

The part which I designate a retainingring it is obvious may be no ring at all in a strict sense, but simply a roughened surface or a series of depressions, as m, formed in the top of the body A, as in Figs. G and 7, or it may be a ring having an undulatory surface, as O in Figs. l to 5, the essentials being simply that there shall be a projection located on one member and a roughened surface with which it may co-operate located on the other Section.

Instead of a circular finger-piece, it may be T-shaped, as in Figs. 6 and 7, and While it is not essential that a regular handle be used, as the pipe and projecting end of the body may be grasped with facility, still I preferably attach or form a handle P on the rear end of the body of the cock, with means for attaching the pipe to the rear end of the 11andle, as shown in Fig. it.

In operation the Workman grasps the tool at any convenient point with one hand and with the other grasps thehandle or cock, with his thumb resting on the finger-piece, as shown in Fig. l. He maynow rotate the key to control the air-passage Without changing the position of either hand in the least. Usually the retaining-ring and projection Il are so constructed that the key may be turned with a moderate pressure on the iinger-picce; but if it does not move easily the Workman by simply pushing upward slightly may disengage the projection and ring and turn the key to the desired adjustment without difficulty.

The device puts the tool under perfect confinger-piece pivotally connected to the top of f the key and the retaining projection and ring, substantially as described.

2. In a graduated cock for pneumatic tools, the combination, with the body and key, ot the iinger-piece pivoted to lthe upper end of the key, the projection and co-operating retainingring, and the spring engaging the finger-piece to keep the ring and projection in engagement, substantially as described.

3. In a graduated cock for pneumatic tools, the combination, with the body and key having the upper end recessed, of the finger-piece pivoted to the u pperend of the key, the spring seated in the recess and engaging the under side of the finger-piece, and the projection and co-operating retaining-ring held in engagement by the spring, substantially as described.

et. In a cock for pneumatic tools, adapted to be heldin the hand, the combination, with the body having the handle projecting at one end, of the key and the finger-piece mounted on the upper end of the key, substantially as described.

5. In a cock for pneumatic tools, adapted to be held in the hand, the combination, with the body having one end formed for attachment to the tool and the handle on the opposite end, with means for attaching the supplypipe thereto, of the key and the finger-piece mounted on the upper end of the key, substantially as described.

DANIEL DRAWBAUGU.

Writnesses:

W. M. IIAIN, ERNEsr MARX. 

